JPH0541906B2 - - Google Patents

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Publication number
JPH0541906B2
JPH0541906B2 JP61018453A JP1845386A JPH0541906B2 JP H0541906 B2 JPH0541906 B2 JP H0541906B2 JP 61018453 A JP61018453 A JP 61018453A JP 1845386 A JP1845386 A JP 1845386A JP H0541906 B2 JPH0541906 B2 JP H0541906B2
Authority
JP
Japan
Prior art keywords
pressure
section
temperature
value
output signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP61018453A
Other languages
Japanese (ja)
Other versions
JPS62175558A (en
Inventor
Kazuhiro Ueda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP1845386A priority Critical patent/JPS62175558A/en
Publication of JPS62175558A publication Critical patent/JPS62175558A/en
Publication of JPH0541906B2 publication Critical patent/JPH0541906B2/ja
Granted legal-status Critical Current

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  • Air Conditioning Control Device (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は冷凍装置に関し、時にインバータを
用いて圧縮機の回転制御を行うようにした冷凍装
置の改良に関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a refrigeration system, and relates to an improvement in a refrigeration system that sometimes uses an inverter to control the rotation of a compressor.

〔従来の技術〕[Conventional technology]

インバータを有する冷凍装置は、電源周波数を
変化させることによつて、冷媒圧縮機を駆動する
電動機の回転を制御するものである。そして、こ
のように圧縮機の回転速度を制御することによ
り、冷凍能力を連続的に変化させ得るものであ
る。
A refrigeration system having an inverter controls the rotation of an electric motor that drives a refrigerant compressor by changing the power frequency. By controlling the rotational speed of the compressor in this way, the refrigerating capacity can be changed continuously.

第2図は従来から一般に用いられているインバ
ータを有する冷凍装置の一例を示す構成図であつ
て、1は冷媒を圧縮する圧縮機、2は凝縮器、3
は膨張装置として上記従来装置に使用されている
膨張弁、4は蒸発器であり、これらは管路を介し
て閉ループに接続されることにより冷凍回路を構
成している。5は商用電源の周波数を変化させて
出力するインバータ、また、6は上記冷凍回路の
低圧側の冷媒圧力を検出する圧力検出部7の出力
信号に応じてインバータ5を制御する制御部であ
る。8は上記インバータ5と圧縮機1とを結ぶ電
源ラインに設けた電磁接触器、9は同じく上記電
源ラインに直列に設けた過電流継電器である。
FIG. 2 is a block diagram showing an example of a refrigeration system having an inverter that has been commonly used in the past, in which 1 is a compressor for compressing refrigerant, 2 is a condenser, and 3
Reference numeral 4 indicates an expansion valve used in the conventional device as an expansion device, and 4 an evaporator. These are connected in a closed loop via a pipe line to constitute a refrigeration circuit. 5 is an inverter that changes the frequency of the commercial power source and outputs the same, and 6 is a control unit that controls the inverter 5 in accordance with an output signal from a pressure detection unit 7 that detects the refrigerant pressure on the low pressure side of the refrigeration circuit. 8 is an electromagnetic contactor provided on a power line connecting the inverter 5 and the compressor 1, and 9 is an overcurrent relay also provided in series with the power line.

上記のように構成された従来の冷凍装置におい
て、電源スイツチ(図示せず)を投入すると、電
磁接触器8が閉じられてインバータ5から出力さ
れる電力が圧縮機1の電動機(図示せず)に供給
され、圧縮機1が駆動される。圧縮機1が動作す
ることにより、上記圧縮機1より吐出された冷媒
が冷凍サイクルを形成し、周知のように、蒸発器
4において冷却が行われる。
In the conventional refrigeration system configured as described above, when the power switch (not shown) is turned on, the electromagnetic contactor 8 is closed and the electric power output from the inverter 5 is transferred to the electric motor of the compressor 1 (not shown). The compressor 1 is driven. When the compressor 1 operates, the refrigerant discharged from the compressor 1 forms a refrigeration cycle, and is cooled in the evaporator 4 as is well known.

ここで、冷凍負荷が少なくなると、例体回路の
低圧側の冷媒圧力が下がり、これに伴つて圧力検
出器7から制御部6に出力される圧力検出信号の
レベルも低下する。制御部6では上記圧力検出信
号を基準値と比較しているため、圧力検出信号が
基準値よりも低い場合には、制御部6はインバー
タ5をその出力周波数を低下するように制御し、
圧縮機1の回転数を下げることによつて冷却能力
を下げる。このようにして冷却能力が下げられる
と、冷凍回路の低圧側の冷媒圧力が上昇し設定圧
力に収束する。
Here, when the refrigeration load decreases, the refrigerant pressure on the low pressure side of the example circuit decreases, and the level of the pressure detection signal output from the pressure detector 7 to the control unit 6 also decreases accordingly. Since the control section 6 compares the pressure detection signal with the reference value, if the pressure detection signal is lower than the reference value, the control section 6 controls the inverter 5 to lower its output frequency,
By lowering the rotation speed of the compressor 1, the cooling capacity is lowered. When the cooling capacity is lowered in this way, the refrigerant pressure on the low pressure side of the refrigeration circuit increases and converges to the set pressure.

また、冷却負荷が高い場合には、冷凍回路の低
圧側の冷媒圧力が上昇し、これに伴つて圧力検出
部7から制御部6に出力される圧力検出信号の信
号レベルが上昇する。この結果、制御部6はイン
バータ5をその出力周波数が上昇するように制御
し、圧縮機1の回転数を上昇させることにより、
冷却能力を増加させる。
Further, when the cooling load is high, the refrigerant pressure on the low pressure side of the refrigeration circuit increases, and the signal level of the pressure detection signal output from the pressure detection section 7 to the control section 6 increases accordingly. As a result, the control unit 6 controls the inverter 5 so that its output frequency increases, and increases the rotational speed of the compressor 1.
Increase cooling capacity.

従つて、このようなインバータ5を有する冷凍
装置においては、これは冷却負荷に応じた冷却能
力に制御することができ、省電力化が可能とな
る。
Therefore, in a refrigeration system having such an inverter 5, the cooling capacity can be controlled in accordance with the cooling load, making it possible to save power.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

しかし、上記従来の冷凍装置では、凝縮圧力が
大きく変動する場合等に冷却が不足したり、省電
力が充分に行なわれないことがあつた。即ち、冷
凍装置では低圧側圧力は高圧側圧力の影響を受け
負荷条件が同一でも、高圧側圧力が高くなると低
圧側圧力が上昇し、高圧側圧力が低くなると低圧
側圧力も低下する。従つて夏季の運転によつて収
束させる圧力を設定すると、冬季には高圧側圧力
が低下するので、庫内温度が充分に低下していな
くとも低圧側圧力が設定圧力以下になり、出力周
波数が減少し、冷却能力が低下する。よつて、庫
内の冷却が緩慢になつたり、時によつては所定温
度にまで冷えないことがあつた。また、冬季の運
転で収束させる圧力を設定すると、冬季には高圧
側圧力が上昇し、低圧側圧力も高くなるので、設
定圧力以上で運転し、出力周波数が高く維持され
省電力効果が充分に得られないことがあると云う
欠点があつた。
However, in the above-mentioned conventional refrigeration apparatus, cooling may be insufficient or power saving may not be sufficient when the condensing pressure fluctuates greatly. That is, in a refrigeration system, the low-pressure side pressure is influenced by the high-pressure side pressure, and even if the load conditions are the same, when the high-pressure side pressure increases, the low-pressure side pressure increases, and when the high-pressure side pressure decreases, the low-pressure side pressure also decreases. Therefore, if the pressure is set to converge during summer operation, the high-pressure side pressure will drop in the winter, so even if the internal temperature has not dropped sufficiently, the low-pressure side pressure will fall below the set pressure, and the output frequency will decrease. cooling capacity decreases. As a result, the inside of the refrigerator cooled slowly, and sometimes did not reach a predetermined temperature. In addition, if you set the pressure to converge during winter operation, the high pressure side pressure will rise and the low pressure side pressure will also increase in winter, so the operation will be performed above the set pressure, the output frequency will be maintained high, and the power saving effect will be sufficient. The drawback was that there were some things that could not be obtained.

この発明は上記のような従来の問題を解決した
もので、低圧側圧力を検出し冷媒圧力を所定の値
に収束させると共に、運転状態に応じ収束させる
設定圧力値を変更することにより、常に確実な冷
却と省電力が図れる冷凍装置を提供することを目
的としたものである。
This invention solves the above-mentioned conventional problems. It detects the low pressure side pressure, converges the refrigerant pressure to a predetermined value, and changes the set pressure value for convergence depending on the operating condition, thereby ensuring constant reliability. The purpose of this invention is to provide a refrigeration system that can provide efficient cooling and power savings.

〔問題点を解決するための手段〕[Means for solving problems]

この発明に係る冷凍装置は、各機器が閉ループ
に配管接続された冷凍回路、圧縮機の回転数制御
用インバータ、冷凍回路低圧側圧力検出部、この
圧力検出部の圧力検出信号と設定圧力値とを比較
する圧力比較部、及び低圧側圧力を設定圧力値に
収束するようにインバータの出力周波数を設定す
る周波数設定部を有する冷凍装置において、冷凍
庫内温度検出信号と設定温度値とを比較する温度
比較部、及び上記圧力比較部の出力信号と上記温
度比較部の出力温度と上記周波数設定部の出力信
号とに応じ、温度検出部検出温度が設定温度値以
上である時の温度比較部の出力信号と、圧力検出
部の圧力検出部が設定圧力値以下である時の圧力
比較部の出力信号と、そして周波数設定部の設定
周波数が最低値である時の周波数設定部出力信号
とが同時に入力された時に、圧力比較部の設定圧
力値をその時の検出圧力より所定値低く変更さ
せ、温度検出部検出温度が設定温度値以下である
時の温度比較部の出力信号と、圧力検出部の圧力
検出信号が設定圧力値以上である時の圧力比較部
の出力信号と、そして周波数設定部の設定周波数
が所定値以上である時の周波数設定部出力信号と
が同時に入力された時に、圧力比較部の設定圧力
値をその時の検出圧力より所定値高く変更させる
よう、圧力比較部の設定圧力値を制御する設定圧
力制御部を備えることにより冷凍装置を構成して
上記目的を達成するものである。
The refrigeration system according to the present invention includes a refrigeration circuit in which each device is pipe-connected in a closed loop, an inverter for controlling the rotation speed of the compressor, a pressure detection section on the low pressure side of the refrigeration circuit, and a pressure detection signal and a set pressure value of the pressure detection section. In a refrigeration system that has a pressure comparison section that compares the temperature and a frequency setting section that sets the output frequency of the inverter so that the low pressure side pressure converges to the set pressure value, the temperature that compares the freezer internal temperature detection signal and the set temperature value is The output of the temperature comparison section when the temperature detected by the temperature detection section is equal to or higher than the set temperature value according to the output signal of the comparison section and the pressure comparison section, the output temperature of the temperature comparison section, and the output signal of the frequency setting section. The signal, the output signal of the pressure comparison section when the pressure detection section of the pressure detection section is below the set pressure value, and the output signal of the frequency setting section when the set frequency of the frequency setting section is the lowest value are input simultaneously. The set pressure value of the pressure comparison section is changed to a predetermined value lower than the detected pressure at that time, and the output signal of the temperature comparison section and the pressure of the pressure detection section are changed when the temperature detected by the temperature detection section is below the set temperature value. When the output signal of the pressure comparison section when the detection signal is equal to or higher than the set pressure value and the output signal of the frequency setting section when the set frequency of the frequency setting section is equal to or higher than the predetermined value are input simultaneously, the pressure comparison section The above object is achieved by configuring a refrigeration system by including a set pressure control section that controls the set pressure value of the pressure comparison section so that the set pressure value of the refrigeration system is changed to a predetermined value higher than the detected pressure at that time.

〔作用〕[Effect]

この発明における冷凍装置はインバータの出力
周波数が最低値にまで低下しても、低圧側圧力が
設定圧力以下で、かつ庫内温度が設定温度以上の
場合には収束させる設定圧力を低く変更し、庫内
温度が設定温度以下になつた時の低圧側圧力が設
定圧力以上であつて、かつその時の出力周波数が
所定値以上であつた場合は収束させる設定圧力を
高く変更することにより、常に確実な冷却と省電
力が図れる。
In the refrigeration system of the present invention, even if the output frequency of the inverter drops to the lowest value, if the low pressure side pressure is below the set pressure and the internal temperature is above the set temperature, the set pressure for convergence is changed to a lower value, If the low pressure side pressure is above the set pressure when the internal temperature falls below the set temperature, and the output frequency at that time is above the predetermined value, the set pressure for convergence is changed to a higher value to ensure constant control. This allows for better cooling and power savings.

〔発明の実施例〕[Embodiments of the invention]

第1図はこの発明による冷凍装置の一実施例を
示す構成図であつて、第2図と同一部分は同一符
号を用いて示してある。図において、10は被冷
却物の温度或いは庫内温度等を検出する温度検出
部であり、11は上記温度検出部10の温度検出
信号が入力され、この温度検出信号と予め設定さ
れた温度値とを比較する温度比較部である。12
は圧力検出部7の圧力検出信号を入力とし、この
圧力検出信号と予め設定された圧力値とを比較す
る圧力比較部であつて、この実施例では上記設定
圧力値は上の値が3.0Kg/cm2、下の値が2.8Kg/cm2
になつており、検出圧力が3.0Kg/cm2を越えると
出力周波数を増加させるための出力信号を、検出
圧力が2.8Kg/cm2未満の場合は出力周波数を減少
させるための出力信号を、そして検出圧力が3.0
〜2.8Kg/cm2の間にある場合は現状の出力周波数
を接続するための出力信号を発する。13は上記
圧力比較部の出力信号により、インバータ5の出
力周波数を設定する周波数設定部であつて、設定
周波数の範囲は0及び30〜75Hzになつている。1
4は設定圧力の制御部であつて、温度比較部11
と圧力比較部12と周波数設定部13からの出力
信号を受けて上記設定圧力値を変更または維持す
るように設御する。すなわち、温度検出部10の
検出温度が予め設定された温度値以上で、これに
対応する出力信号が温度比較部11から供給され
ており、圧力検出部7の検出圧力が2.8Kg/cm2
満で、これに対応する出力信号が圧力比較部12
から供給され、かつインバータ5の出力周波数が
最低値である30Hzであるような出力信号が周波数
設定部13から供給されている場合は設定圧力制
御部14が設定圧力の上の値をいま検出している
圧力より0.2Kg/cm2だけ低く変更し、下の圧力も
同じ値だけ下げる。例えば検出圧力が2.6Kg/cm2
の場合、上の値を2.4Kg/cm2に、下の値を2.2Kg/
cm2に変更する。この結果、検出圧力が設定圧力の
上の値より高いことになり、出力周波数が増加し
冷却能力も増大するので、庫内温度が低下し所定
の温度になる。
FIG. 1 is a block diagram showing an embodiment of a refrigeration system according to the present invention, and the same parts as those in FIG. 2 are designated by the same reference numerals. In the figure, 10 is a temperature detection section that detects the temperature of the object to be cooled or the temperature inside the refrigerator, and 11 is a temperature detection section into which the temperature detection signal of the temperature detection section 10 is input, and this temperature detection signal and a preset temperature value are input. This is a temperature comparison section that compares the 12
is a pressure comparison unit which inputs the pressure detection signal from the pressure detection unit 7 and compares this pressure detection signal with a preset pressure value. In this embodiment, the upper value of the set pressure value is 3.0 kg. /cm 2 , the lower value is 2.8Kg/cm 2
The output signal is to increase the output frequency when the detected pressure exceeds 3.0Kg/ cm2 , and the output signal to decrease the output frequency when the detected pressure is less than 2.8Kg/ cm2 . And the detection pressure is 3.0
If it is between ~2.8Kg/ cm2 , it will emit an output signal to connect the current output frequency. Reference numeral 13 denotes a frequency setting section that sets the output frequency of the inverter 5 based on the output signal of the pressure comparison section, and the set frequency range is 0 and 30 to 75 Hz. 1
4 is a control section for the set pressure, and a temperature comparison section 11
In response to the output signals from the pressure comparing section 12 and the frequency setting section 13, the set pressure value is changed or maintained. That is, the detected temperature of the temperature detecting section 10 is equal to or higher than a preset temperature value, the corresponding output signal is supplied from the temperature comparing section 11, and the detected pressure of the pressure detecting section 7 is less than 2.8 Kg/cm 2 The output signal corresponding to this is sent to the pressure comparator 12.
If an output signal is supplied from the frequency setting unit 13 such that the output frequency of the inverter 5 is 30Hz, which is the lowest value, the set pressure control unit 14 detects a value above the set pressure. Change the pressure below by 0.2Kg/cm 2 and lower the pressure below by the same value. For example, the detection pressure is 2.6Kg/cm 2
, the upper value is 2.4Kg/cm 2 and the lower value is 2.2Kg/cm 2.
Change to cm2 . As a result, the detected pressure becomes higher than the set pressure, the output frequency increases, and the cooling capacity also increases, so the temperature inside the refrigerator decreases to a predetermined temperature.

一方、温度検出部10の検出温度が設定温度値
以下の場合は、所定の冷却がなされているので、
上記温度比較部11の出力信号により、周波数設
定部13は優先的にインバータ5の出力がOとな
るように、その出力信号が上記インバータ5に供
給し、圧縮機1を停止させるが、この圧縮機停止
前の圧力検出部7の検出圧力が3.0Kg/cm2以上で
あり、インバータ5の出力周波数が所定の値、例
えば40Hz以上に相当する場合は設定圧力制御部1
4が設定圧力の下の値をその時に検出していた圧
力より0.2Kg/cm2だけ高く変更し、上の圧力も同
じだけ高く変更する。例えば検出圧力が3.3Kg/
cm2の場合、下の値を3.5Kg/cm2に、上の値を3.7
Kg/cm2に変更する。このことにより、庫内温度が
上昇して運転が再開した時には検出圧力が設定圧
力の下の値より低くなり、出力周波数が減少し、
変更前よりは省電力が図られる。
On the other hand, if the temperature detected by the temperature detection unit 10 is lower than the set temperature value, the specified cooling is being performed.
Based on the output signal of the temperature comparison section 11, the frequency setting section 13 supplies the output signal to the inverter 5 preferentially so that the output of the inverter 5 becomes O, and stops the compressor 1. If the detected pressure of the pressure detection unit 7 before the machine stops is 3.0Kg/cm 2 or more and the output frequency of the inverter 5 corresponds to a predetermined value, for example 40Hz or more, the set pressure control unit 1
Step 4 changes the lower value of the set pressure to 0.2Kg/cm 2 higher than the pressure detected at that time, and changes the upper pressure to the same value. For example, the detection pressure is 3.3Kg/
For cm 2 , set the lower value to 3.5Kg/cm 2 and the upper value to 3.7
Change to Kg/ cm2 . As a result, when the internal temperature rises and operation resumes, the detected pressure will be lower than the lower set pressure, and the output frequency will decrease.
Power savings will be achieved compared to before the change.

なお、上記以外の場合、設定圧力はそのまま接
続される。
Note that in cases other than the above, the set pressure is connected as is.

以上の例では、設定圧力が低くする条件が出現
すれば、直ちに変更するようにしたが、その条件
が所定時間接続した時に変更するようにしても良
い。
In the above example, when a condition for lowering the set pressure appears, the setting pressure is changed immediately, but the setting pressure may be changed when the condition is maintained for a predetermined period of time.

〔発明の効果〕〔Effect of the invention〕

この発明は以上説明したとおり、各機器が閉ル
ープに配管接続された冷凍回路、圧縮機の回転数
制御用インバータ、冷凍回路低圧側圧力検出部、
この圧力検出部の圧力検出信号と設定圧力値とを
比較する圧力比較部、及び低圧側圧力を設定圧力
値に収束するようにインバータの出力周波数を設
定する周波数設定部を有する冷凍装置において、
冷凍庫内温度検出信号と設定温度値とを比較する
温度比較部、及び上記圧力比較部の出力信号と上
記温度比較部の出力信号と上記周波数設定部の出
力信号とに応じ、温度検出部検出温度が設定温度
値以上である時の温度比較部の出力信号と、圧力
検出部の圧力検出信号が設定圧力値以下である時
の圧力比較部の出力信号と、そして周波数設定部
の設定周波数が最低値である時の周波数設定部出
力信号とが同時に入力された時に、圧力比較部の
設定圧力値をその時の検出圧力より所定値低く変
更させ、温度検出部検出温度が設定温度値以下で
ある時の温度比較部の出力信号と、圧力検出部の
圧力検出信号が設定圧力値以上である時の圧力比
較部の出力信号と、そして周波数設定部の設定周
波数が所定値以上である時の周波数設定部出力信
号とが同時に入力された時に、圧力比較部の設定
圧力値をその時の検出圧力より所定値高く変更さ
せるよう、圧力比較部の設定圧力値を制御する設
定圧力制御部を備えたことにより、冷凍装置を構
成したので、運転状態に応じ、設定圧力を変更ま
たは持続することができ、運転条件が大きく変動
しても、また当初の設定圧力が不適正であつて
も、常に確実な冷却と省電力が図れるという効果
がある。
As explained above, the present invention includes a refrigeration circuit in which each device is connected via piping in a closed loop, an inverter for controlling the rotation speed of a compressor, a pressure detection section on the low pressure side of the refrigeration circuit,
In a refrigeration system that includes a pressure comparison section that compares the pressure detection signal of the pressure detection section and a set pressure value, and a frequency setting section that sets the output frequency of the inverter so that the low pressure side pressure converges to the set pressure value,
A temperature comparison section that compares a temperature detection signal in the freezer with a set temperature value, and an output signal of the pressure comparison section, an output signal of the temperature comparison section, and an output signal of the frequency setting section, the temperature detection section detects the temperature. The output signal of the temperature comparison section when is above the set temperature value, the output signal of the pressure comparison section when the pressure detection signal of the pressure detection section is below the set pressure value, and the set frequency of the frequency setting section is the lowest. When the frequency setting section output signal when the value is input at the same time, the set pressure value of the pressure comparison section is changed to a predetermined value lower than the detected pressure at that time, and the temperature detected by the temperature detection section is lower than the set temperature value. The output signal of the temperature comparison section, the output signal of the pressure comparison section when the pressure detection signal of the pressure detection section is equal to or higher than the set pressure value, and the frequency setting when the set frequency of the frequency setting section is equal to or higher than the predetermined value. By providing a set pressure control unit that controls the set pressure value of the pressure comparison unit so that the set pressure value of the pressure comparison unit is changed to a predetermined value higher than the detected pressure at that time when the pressure comparison unit output signal is input at the same time. , the refrigeration system is configured so that the set pressure can be changed or maintained depending on the operating conditions, and even if the operating conditions change significantly or the initial set pressure is inappropriate, reliable cooling is always achieved. This has the effect of saving power.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図はこの発明による冷凍装置の一実施例を
示す構成図、第2図は従来の冷凍装置を示す構成
図である。 1は圧縮機、2は凝縮器、3は膨脹装置、4は
蒸発器、5はインバータ、7は圧力検出部、10
は温度検出部、11は温度比較部、12は圧力比
較部、13は周波数設定部、14は設定圧力制御
部である。なお、図中、同一符号は同一または相
当部分を示す。
FIG. 1 is a block diagram showing an embodiment of a refrigeration system according to the present invention, and FIG. 2 is a block diagram showing a conventional refrigeration system. 1 is a compressor, 2 is a condenser, 3 is an expansion device, 4 is an evaporator, 5 is an inverter, 7 is a pressure detection unit, 10
11 is a temperature detection section, 11 is a temperature comparison section, 12 is a pressure comparison section, 13 is a frequency setting section, and 14 is a set pressure control section. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

【特許請求の範囲】[Claims] 1 圧縮機、凝縮器、膨張装置及び蒸発器が閉ル
ープを形成するように配管接続された冷凍回路、
電源周波数を変化させて上記圧縮機の回転数を制
御するインバータ、上記冷凍回路の低圧側圧力を
検出する圧力検出部、この圧力検出部の圧力検出
信号を入力とし、この圧力検出信号と予め設定さ
れた圧力値とを比較する圧力比較部、及び上記圧
力比較部の出力信号に応じ上記低圧側の圧力を上
記設定圧力値に収束するようにインバータの出力
周波数を設定する周波数設定部を有する冷凍装置
において、上記冷凍回路にて冷却される庫内温度
を検出する温度検出部、この温度検出部の温度検
出信号を入力としこの温度検出信号と予め設定さ
れた温度値とを比較する温度比較部、及び上記圧
力比較部の出力信号と上記温度比較部の出力信号
と上記周波数設定部の出力信号とに応じ、上記温
度検出部の検出温度が予め設定された温度値以上
である時の上記温度比較部の出力信号と、上記圧
力検出部の圧力検出信号が予め設定された圧力値
以下である時の上記圧力比較部の出力信号と、そ
して上記周波数設定部の設定周波数が最低値であ
る時の周波数設定部の出力信号とが同時に入力さ
れた時に、上記圧力比較部の設定圧力値をその時
の検出圧力より所定値低く変更させ、上記温度検
出部の検出温度が予め設定された温度値以下であ
る時の上記温度比較部の出力信号と、上記圧力検
出部の圧力検出信号が予め設定された圧力値以上
である時の上記圧力比較部の出力信号と、そして
上記周波数設定部の設定周波数が所定値以上であ
る時の周波数設定部の出力信号とが同時に入力さ
れた時に、上記圧力比較部の設定圧力値をその時
の検出圧力より所定値高く変更させるよう、上記
圧力比較部の設定圧力値を制御する設定圧力制御
部を備えたことを特徴とする冷凍装置。
1 A refrigeration circuit in which a compressor, a condenser, an expansion device, and an evaporator are connected via piping to form a closed loop;
An inverter that controls the rotation speed of the compressor by changing the power supply frequency, a pressure detection section that detects the low pressure side pressure of the refrigeration circuit, and a pressure detection signal from this pressure detection section as input, and a preset value with this pressure detection signal. and a frequency setting section that sets the output frequency of the inverter so that the pressure on the low pressure side converges to the set pressure value according to the output signal of the pressure comparison section. The apparatus includes a temperature detection section that detects the temperature inside the refrigerator cooled by the refrigeration circuit, and a temperature comparison section that receives a temperature detection signal from the temperature detection section and compares this temperature detection signal with a preset temperature value. , and the temperature when the detected temperature of the temperature detection section is equal to or higher than a preset temperature value according to the output signal of the pressure comparison section, the output signal of the temperature comparison section, and the output signal of the frequency setting section. The output signal of the comparison section, the output signal of the pressure comparison section when the pressure detection signal of the pressure detection section is below a preset pressure value, and the output signal of the pressure comparison section when the set frequency of the frequency setting section is the lowest value. When the output signal of the frequency setting section is input at the same time, the set pressure value of the pressure comparison section is changed to a predetermined value lower than the detected pressure at that time, and the detected temperature of the temperature detection section is lower than the preset temperature value. an output signal of the temperature comparison section when the pressure detection signal of the pressure detection section is equal to or higher than a preset pressure value, and a set frequency of the frequency setting section. The set pressure of the pressure comparison section is set such that when the output signal of the frequency setting section is input at the same time as the output signal of the frequency setting section when A refrigeration system characterized by comprising a set pressure control section that controls a value.
JP1845386A 1986-01-28 1986-01-28 Refrigerator Granted JPS62175558A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1845386A JPS62175558A (en) 1986-01-28 1986-01-28 Refrigerator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1845386A JPS62175558A (en) 1986-01-28 1986-01-28 Refrigerator

Publications (2)

Publication Number Publication Date
JPS62175558A JPS62175558A (en) 1987-08-01
JPH0541906B2 true JPH0541906B2 (en) 1993-06-24

Family

ID=11972046

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1845386A Granted JPS62175558A (en) 1986-01-28 1986-01-28 Refrigerator

Country Status (1)

Country Link
JP (1) JPS62175558A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0799287B2 (en) * 1986-06-24 1995-10-25 ダイキン工業株式会社 Air conditioner
JP2004116995A (en) * 2004-01-26 2004-04-15 Hitachi Ltd Refrigeration equipment

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5864437A (en) * 1981-10-14 1983-04-16 Nippon Denso Co Ltd Control on refrigerating cycle
JPS60223963A (en) * 1984-04-20 1985-11-08 三菱電機株式会社 Refrigeration equipment

Also Published As

Publication number Publication date
JPS62175558A (en) 1987-08-01

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